Improved water-tight cask



NITED STATES PATENT OFFICE.

D. C. RAND AND M. WADHAMS, OF PERINTON, NEW YORK.

IMPROVED -WATER-TIGHT CA3 K.

Specification forming part of Letters Patent No. 33,168, dated August 1'2, 1862.

The object of our invention is to produce a cask containing materials that readily absorb moisture, rendered entirely impervious to wa-.

ter, either when immersed or by the gradual absorption of the atmosphere.

The process employed consists in coating the interior surface of the cask with a resinous cement, so applied as to fill not onlyth'e pores oi the wood, but the joints or crevices of common cooperage not intended astight work. For this purpose we employcoal or gas tar, which we evaporate by boiling in any convenient manner until it acquires the necessary consistency to harden perfectly on cooling. This may be determined by placing a small. quantity on any surface where it may become cold, and if it is no longer adhesive to the touch it has acquired the necessary dc 'gree of concentration. It is poured into the bung of the closed cask,which must be immediately rolled and turned in every direction, so that no part .of the surface will remain uncovered, when the excess may be drained off by placing the bang downward. An interior coating will be found sufiicient for nearly all purposes; but if there is danger of constant external exposure to water, the extorior surface may also be covered either by immersion or by applying rapidly with a brush.

The cement thus applied penetrates deeply into the pores of the wood, thereby preserving it from decay, and also forms a thick coating,

which closes the joints of the staves, wormholes, and other imperfections of the timber,

and entirely prevents the absorption of moistor kegs, while it enables manufacturers of that article to use a cheaper-kind of cooperage,and thereby save nearly half the ordinary expense.- The cost of applying thisprocess is insignificant both as regards the material and labor. It is equally beneficial for casks containing leaky and penetrating fluidsas various kinds of oils-which otherwise require the very best of barrels both in timber and workmanship to contain them.

' What we claim as onrinvention, and desire to secure by Letters Patent as a new article of manufacture, is

A close cask rendered impervious to moistare by a coating of concentrated coal-tar,substantially as and for the purposes herein set forth.

In witness whereof we have hereunto signed our names in the presence of two subscribing witnesses.

D. O. RAND.

M. \VADHAMS.

\Vitnesscs: v

J. FRASER,

M. CANFIELD. 

